Calculate your perfect calorie and macro targets
The Mifflin-St Jeor Equation is used to calculate your maintenance calorie intake. The "adjusted calories" section allows for a slight calorie surplus when selecting "bulking" (+300 calories) or a deficit when selecting "cutting" (-300 calories).
You can ignore this section and use only the calculated maintenance calories for a more drastic cut or bulk. These calorie and macronutrient goals should be met daily.
Keep in mind that this is a rough estimate and may require adjustments to better suit your body's needs.